Process of renewing filaments in lamps.



A2 A WILKSNS.

PROCESS 0F RENEWING HLAMENTS IN LAMPS.

APPHCATIOH FILED APR. 2.19M.

Patented Ovt. 24, 1916.

Invsnrar:

UNITED STATES PATENT OFFICE.

ALBERT A. WILKINS, OF MIDDLETON, MASSACHUSETTS, ASSIGNOR b1 ONE-HALF TO CHARLES E. CAMPBELL AND FREDERICK R. CAMPBELL, BOTH OF LYNN, MASSA- PROCESS OF RENE-WIN G FILAMENTS IN LAMPS.

To alltofwm it may comem Be it known that I, Annnn'r A. WILKINS, a. citizen of the United States, residin at Middleton, in the county of Essen and tate ofMassachusetts, have invented certain new and useful Improvements in Processes of Renewing Filaments in Lamps, of which the following is 11/ specification.

My invention relates to improvements in processes of renewing filaments in lamps, and the object of my improvement is to provide means for renewing the filaments of" incandescent lamps that are suitable for use I with-lamps having tungsten filaments of the type connected in circuits of fairly high vo tages and in, which the filament is of ap reciable length.

n the auz companying drawing, Figure 1 is a side elelvation a lamp having a broken filament and which process. Fig. 2 is a similar view of the same in the tubulated condition, and with a holder for the tabulated end and a holder for the base end indicated 'by broken liitees. Fig. 3 is a similar view of the same :2 having a flame applied to the side wall and the upper part raised and separated from the lower part. Fig. 4 is a si ilar view of the lower or base part with a ew filament applied thereto. Fig. 5 is a similar view s owing the upper and lower parts reunited. 1Fig. 6 is a similar view of the refinished amp.

The lamp shown in Fig. 1 is of the m dinary tungsten type and comprises a bulb having the tip 11 at the upper end and provided with a base 12 at the ower d and in .which is housed a filament 13, shown as broken in the said fihgure, and suitable sup' ports for the said lament 13. The said supports comprise a. post 1d of glass extending axially from the stem 15, adjacent the base end, and upwardly for an appreciable portion of the interior space of the bu1b-10, and two sets of arms supported by the said post '14 and projecting radially therefrom, respectively a set of ower arms 16 ad]acent the stem and a set of upper arms 17 at the extreme upper end of the post 14.

The filament 13 is normallystrung back and forth between the arms 16 and 17, the ends thereof being connected to the leading in wires 18, supported from the stem 15.

Specification 0! Letters Patent.

Application filed April 2, 1914. Serial no. 828,982.

is to be renewed by my.

leaves Patented Oct. 24, 1916.

The first step in the process of renewing the filament 13 is preferably to tubulate the lampJ in an ordinary manner b connecting a tu e 19 at the tip 11. A holder 20 may be provided for the base 12 and a holder2i for the tube 19. K

In the next operation the lamp is revolved and a fine flame is applied to the'side wall 22 until the material of the side wall, which of course is glass, softens; after whic the upper portion 23 is raised from the ower ortion 24, the glass at the line of rupture eing drawn out qluitti 1 thin, on both the upper portion 23 andzt e lower portion 24.

he upper portion 23 is then removed clear the lower portion 24, after which the new filament 13 is readily put in place and mounted on'tho proper su ports. Then the upper portion 23 o the Bulb 10 is recon rzected to the lower portion 24, the junction [5 of. the opposed edges of the said two per teens-being sealed by the ap lication ofheat. and which operation may be eflectedgby a specially constructed machineseal, the oper iion itself being facilitated by the feet that tie two edges united are the same'thaigwen originally severed, and also by the flip't' ithal but this is not so desirable becauseit he sum relatively thick edge anrif'tesuln in an a cessive amount of breakage.

The" junction 25 of the u p' portion 3 a in it renewed and'the lower portion 24 a lamp will in most cases be'less n doth and uni orm than. the adjacent original will 22. For this reason I'prefer to dividethe bulb 10 along a radial plane adjacent the set of lower supporting arms 16' that an port tlt filament 13 or between the same an the bask 12 so that the junction is removedfrom the hormal radiating zone of the filament 13.

After the two ortions 28 and 24 have been reunited as e cribed the lam' is ex hausted by means o thetube 19 an a new tip 11 formed. a I

It is evident that the prooess'described for the renewal of filammts'is particularly advantageous in the renewal ortun'gstenfilaments such as are ,uselilfor ordi.nry1commercial voltages, and which filaments are quite long and are distributed about considerable of the space inclosed by the bulb.

What I claim as my invention is The process of renewing the filament of an incandescent lamp having a filament housed in a glass bulb, comprising heating a, limited zone extending around the body portion of the said bulb y means of a relatively fine flame, elongating the material of the said zone while so heated so as to .draw the said material relatively quite thin,

separating the ,two parts of the said body portion by cracking the said drawn material of the said zone, ment while the said parts are so separated, and reuniting the said parts by sealing together the edges of the material of the zone, whereby the said body portion will be restored substantially as before the said parts 20 were separated.

ALBERT A. WILKINS.

Witnesses:

GALEN B. Hown, Josaru A. MCKENNA.

operating on the fila 15 

